#include <iostream>
using namespace std;

void swap(int& a, int& b);

int main(){

	int x=7, y=13;

	cout << "[" << x << "," << y << "]" << endl;
	swap(x,y);
	cout << "[" << x << "," << y << "]" << endl;

	return 0;

}

void swap(int& a, int& b){

	int aux;

	aux=a;
	a=b;
	b=aux;
}

